Half to william d



( 0 Model.)

R. FREEMAN.

FURNACE. No. 480,086. Patented Aug. 2, 1892.

u a 27 ii a I 5! ff 4 T l I if 3/ 13 H Hi Z1 [1 UNITED STATES PATENT OFFICE.

THOMAS R. FREEMAN, OF SIOUX FALLS, SOUTH DAKOTA, ASSIGNOR OF ONE- HALF TO WILLIAM D. ROBERTS, OF SAME PLACE.

FUVRNACE.

SPECIFICATION forming part of Letters Patent No. 480,086, dated August 2, 1892.

Application filed April 21,1892. SerialNo. 430,123. (No model.)

To all whom it may concern.-

Be it known that I, THOMAS E. FR EMAN, a citizen of the United States, residing at Sioux Falls, in the county of Minnehaha and State of South Dakota, have invented certain new and useful Improvements in'Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention-relates to stoves and furnaces, and more especially-to that class thereof known as hot-air furn'aces, because its office I5 is to heat air which is subsequently conveyed to the rooms or apartments to be heated.

The object of the present invention is to improve the construction of radiators used in such a furnace to the end that the air will be" more thoroughly heated than heretofore, as well as to improve the details of construction of the whole.

To this end the invention consists in a furnace constructed substantially as hereinafter 2 5 more fully described and claimed, and as illustrated in the accompanying drawings, in which-- Figure 1 is a central vertical section of the entire furnace and easing, the parts being arranged to direct the products of combustion as indicated by the arrows. Fig. 2 is a horizontal section thereof on the line 2 2 of Fig. 1. Fig. 3 is a right-side elevation of the upper portion of the furnace, showing the'casing 3 5 in dotted lines. Fig. 4 is a front elevation of the upper portion of the furnace.

In the said drawings the casing is shown in two parts, the lowermost one 1 having a hottom flange 2, resting on the support, (not shown,) and through which support the cold air is fed to the furnace, as usual, and the uppermost one 2 being connected detachably, as at 3, with the upper edge of the lower part and having the hot-air pipes 4, which lead to the rooms or apartments to be heated, as will be understood. This casing is here show-n as of sheet metal, although it may be of masonry, brickwork, or any other material, as preferred. Within the lowermost part 1 is a deflector 5, inclined so as to direct the cold air toward and against the body of the furnace, whereby it will be heated thoroughly before it passes into the pipes 4.

' Supported in any suitable manner. within the casing, as by braces 6, is the ash-pit 7, having the usual door 8, and 9 is the grate having the shaker 10 and located at the bottom of the fire-pot 11.

12 is a small door opening into the fire-pot 11 above the grate, through which door a suitable instrument maybe passedforcleaning the grate or other purposes, the front of the fire-pot being cut away, as at 13.

At the upper end of the fire-pot is the heating or combustion chamber 20, connected directly therewith and opening thereinto, as shown, this chamber preferably having a convex top2 1. From the rear of the chamber 20, 'nearits top, opens the usual exit-flue 22, which leads thence downward through adamper 23 to a box 24, and a pipe 25 connects this box directly with the smoke-flue 26 and thence with the chimney. The damper 23 is operated by a handle23, which leads through the casing about as shown. Depending from the box-24 is the dust-exit flue 27, having a damper 28, operated by a handle 28, leading,

also, through the casing and then connecting with the rear of the asl1-pit,whereby the dust in the ash-pit during shaking of the grate may be conveyed to the chimney and the draft regulated, all as is now common in furnaces of this character, save, perhaps, in the specific details of construction.

Coming now to the principal part of the in- 8 vention,30 is a curved shield supported within the chamber 20 and opening thereinto over its :rear edge 31, While at its front end a hole 32 :is formed through the body of the furnace.

33 is what I call the front radiator, being a 0 curved box, preferably square or rectangular in cross-section and curving around the front of thefurnaceat its top for-about one-third of a circle, as seen in Fig. 2, its supports being Ibolts, straps, or braces as desired.

The ex- 5 tremities of this radiator are closed and beveled, as seen at 34, and just forward thereof small pipes 35 lead downward and rearward to the front ends of the rear radiator 36, the latter being of similar construction, standing 10o in a plane below the front radiator, occupying the remaining two-thirds of a circle, and opening into the box 2st at its center. A cleaning-opening 37 is provided opposite the hole 32, whereby the upper radiator and the shieldway may be cleaned, and others 38 are formed in the front ends of the lower and rear radiator for the same purpose with reference thereto, all these openings being suitably closed, as seen, and of course opening through the casing.

is the coal-chute, having the door ll, and 42 is a pipe communicating with this chute and opening into the upper radiator, a damper 43 being located in this pipe and operated by a handle 43, as seen. The function of this pipe is to draw the dust and gas from the coalchute when the door is open and coal is being fed to the furnace. At other times the damper 43 is closed, and communication between the chute and the radiator is closed.

\Vith this construction of parts the operation of my improved furnace is as follows: A fire being laid and lighted, the damper 23 is opened and there is a direct draft from the tirepot through the exit-flue 22,box 24-, and smoke flue 26 to the chimney. The fire will thus start with the best possible draft. After the fire has get well under way the exit-damper 23 is closed. This causes the products of combustion to take a course over the rear edge 31 of the shield 30, through the hole 32,dividing and passing to the rear in the upper and front radiator, thence down the two small pipes 35 to and into the lower and rear radiator, reuniting in the box 2a, and then out the smokefiue 26 to the chimney. It will be noticed in Fig. 2 that the radiators occupy most all the space within the casing around the body of the furnace. The result is that the cold air rising within the casing is thrown into close contact with these radiators and thoroughly heated before it is allowed to enter the hotair pipes 4. The small pipes 35, which cause the products of combustion to descend from the front radiator to the rear, somewhat retard their passage through the course provided for them, and hence the metal of the radiators (and of course the surrounding air) is highly heated. The deflector 5, as above stated, throws the cold air against the body of the furnace and warms it to some extent before it reaches the radiators, as will be seen.

All parts of the furnace are preferably of sheet metal, although the materials, sizes, and exact shapes of parts may be changed considerably without departing from the principle of my invention.

hat is claimed as new is- 1. In a furnace, the combination, with the casing, the hot air pipes leading therefrom, the furnace-body, a box in rear thereof, and the smoke-flue leading from said box to the chimney, of a shield within the furnace-body, its rear edge standing near the top and rear of said body and its front opening through said body, a front radiatorbetween the casing and body, curving through about on e-third of a circle and communicating at its center with said opening from the shield, a rear radiator similarly located and occupying the remaining two-thirds of a circle, its center communieating with said box, and depending oblique pipes connecting the ends of the front and rear radiators, as and for the purpose set forth.

2. In a furnace, the combination, with the casing, the hot-air pipes leading therefrom, the furnace-body, a box in rear thereof, an exit-pipe connecting the body with said box, a damper in said pipe, and the smoke-flue leading from the box to the chimney, of an opening at the front of said body near its top, a front radiator between the casingand body, curving throughout part of a circle and communicating at its center with said opening, a rear radiator similarly located, occupying the remaining part of the circle and communicating at its center with said box, and depending oblique pipes connecting the ends of the radiators, as and for the purpose set forth.

3. In a furnace, the combination, with the casing, the hot-air pipes leading therefrom, the furnace-body, a box in rear thereof, a dust-exit flue connecting said box with the ash-pit of the body, a damper in said flue, and the smoke-flue connecting the box with the chimney, of an opening in the front of the furnace-body near its top, a front radiator between the casing and body, curving throughout part of a circle and connecting at its center with said opening, a rear radiator similarly located, occupying the remaining part of the circle and communicating at its center with said box, and depending pipes connecting the ends of said radiators, as and for the purpose set forth.

4. In a furnace, the combination, with the casing, the hot-air pipes leading therefrom, the furnace-body, a box in rear thereof, an exit-pipe connecting the body with said box, a damper in said pipe, a dust-exit flue connecting the box with the ash-pit, a damper in said fine, and the smoke-flue connecting the box with the chimney, of a front radiator between the body and easing,curving throughout part of a circle and communicating at its center with the front of the body, and a rear radiator similarly located, occupying the remaining part of the circle, communicating at its center with said box, and connected at its ends with the ends of the front radiator, as and for the purpose set forth.

5. In a furnace, the combination, with the casing, the hot-air pipes leading therefrom, the furnace-body having a convex top, the coal-chute opening into the front of said body and having a door, and the smoke-flue leading to the chimney, of a front radiator curving around the body within the casing and near the top of said body, with which it communicates at its center, a rear radiator In testimony whereof I affix my signaturein also curving around the body, connected with presence of two witnesses. 1 the front radiator, and communicating with THOMAS E FREEMAN the smoke-fines, a pipe connecting the front 5 radiator with said chute, and a damper in this Witnesses:

pipe, all as and for the purpose hereinbefore J. W. CRAIG, set forth. W. M. CUNNINGHAM. 

